Chin. Phys. Lett.  2021, Vol. 38 Issue (8): 083301    DOI: 10.1088/0256-307X/38/8/083301
Revisiting Laser-Intensity-Dependent Ionization and Fragmentation of C$_{60}$
D. P. Dong1,2, B. H. Yang1,2, D. B. Qian1,2*, W. C. Zhou1,2, S. F. Zhang1,2, and X. Ma1,2*
1Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
2University of Chinese Academy of Sciences, Beijing 100049, China
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D. P. Dong, B. H. Yang, D. B. Qian et al  2021 Chin. Phys. Lett. 38 083301
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Abstract We revisit the laser-intensity-dependent ionization and fragmentation yields of C$_{60}$ molecules irradiated by 25-fs, 798-nm laser pulses based on the approach in which photoions are measured via a velocity map imaging spectrometer working in a time-sliced mode. This approach dramatically improves the signal-to-background ratio compared to those using a simple (traditional) time-of-flight mode (spectrometer), and thus allows us to measure the laser-intensity dependences down to a previously untouched region, which is expected to provide new insights into the intense-field ionization and fragmentation of C$_{60}$. Indeed, we find that the saturation intensities for C$_{60}$ ionizations and the onset intensity for C$_{60}$ fragmentation are much lower than those reported in previous experiments. Furthermore, the derived saturation-intensity dependence on charge distribution demonstrates the validity of the over-the-barrier ionization using a conducting sphere model.
Received: 01 April 2021      Published: 02 August 2021
PACS:  33.80.-b (Photon interactions with molecules)  
Fund: Supported by the National Key R&D Program (Grant No. 2017YFA0402300), and the National Natural Science Foundation of China (Grant Nos. 11974359 and U1632143).
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D. P. Dong
B. H. Yang
D. B. Qian
W. C. Zhou
S. F. Zhang
and X. Ma
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